# Relationship history for MSHA mine 2302018

Current hierarchy: **Benjamin J  Barrett → Barrett Materials Inc → Plant #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Barrett Materials Inc → Plant #1; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Barrett → Plant #1; 1990-03-01 to 2024-11-09; source msha-controller-operator-history
- **controller_controls_operator:** James L  Barrett → Barrett Materials Inc; 1990-03-01 to 2024-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin J  Barrett → Plant #1; 2024-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin J  Barrett → Barrett Materials Inc; 2024-11-10 to current/open; source msha-controller-operator-history